Sporadic low-carb diets may help lower weight, insulin resistance

An intermittent low-carb diet could be better than a standard low-calorie Mediterranean diet for weight loss and lowering insulin, a study finds.

Low-carb diets have been shown in a number of studies to be superior to regular low-calorie diets for various weight health outcomes, but they're notoriously difficult to stick to for a number of people. In this study, researchers followed 115 women who had a family history of breast cancer for four months as they were randomly assigned to one of three diet programs.

One was a very calorie-restricted (650 calories) low-carb diet for two days a week, one was a low-carb diet in which participants could eat unlimited amounts of protein and healthy fats for two days a week, and the last was a standard 1,500-calorie-per-day Mediterranean diet followed every day.

Both of the low-carb diets beat the Mediterranean diet for lowering weight and improving insulin resistance. Women in the low-carb groups lost an average of about 9 pounds, compared to about five pounds in the Mediterranean diet group. Insulin resistance dropped an average 22% in the calorie-restricted low-carb group, 14% in the all-you-can-eat low-carb group and 4% in the Mediterranean diet group.

"Weight loss and reduced insulin levels are required for breast cancer prevention, but [these levels] are difficult to achieve and maintain with conventional dietary approaches," said co-author Michelle Harvie of the Genesis Breast Cancer Prevention Appeal in England in a news release.